As I've mentioned before, Kolata also recently wrote an article explaining that cool-downs are unnecessary. Assuming her reporting is accurate, by skipping both X Stretch and our daily cool-downs during P90X, we could save an hour-and-a-half per week -- almost 20 hours over the course of a single round of P90X -- without adversely affecting our overall athletic performance.

Like I said earlier, stretching feels damn good. But sleeping in feels even better.